This thread has some interesting but to be frank, fanciful ideas. To be blunt, I can't think of anyone involved in the English game who's shown even the slightest indication of being competent to put such a structure in place even if it wouldn't be howled down by protests.
As I've said before, for any such structure to eventuate it would have to be created outside the English RL structure by a whole new organization set up for the purpose.

As I've noted before, we can be pretty sure that the likes of Chelsea, Bayern, FC Barcelona and other big-time pro sports teams never worry about about how many visiting fans will come to their stadium every season and buy their tickets, programs, food and/or drink because they have plenty of money coming in from TV, sponsorship and their own followers.

Not unbelievable at all. Sports franchises in North America routinely appreciate in value and are hot items when they go on the market. An MLS expansion franchise could be had for 10 million US$ back in 2007 when Toronto FC was admitted, today MLS wants 20 times that amount for new ones. Established franchises are always worth than expansion franchises for the simple reason that they're already established, so TFC's owners have made over 2,000% in capital appreciation on their investment, or an average annual return of more than 28.36%.

The Wolfpack is worth 40 million C$ for the simple reason that a 25% share was just sold for 10 million C$ and 4 x 10 = 40. If 1/4 of something is worth 10 million — which it evidently is given that that share has just changed hands for that very amount — then simple math shows that the whole is worth 40 million, otherwise the 25% share would never have fetched 10 million, would it now?

I was referring to the spectacular 40+ fold growth in the franchise's value. 12.5 million C$ in two years is also a modest amount by North American standards, it's only about half of what CFL teams spend in one season.

I'd go so far as to say that no way would he have lost interest. Two years ago they paid the RFL under 1 million C$ (a pittance in North American terms) to join and Argyle has just sold a 25% interest in the Woflpack for more than 10 times that amount, so it's fabulously profitable for him already.
In short, the Wolfpack's value has gone from under1 million C$ to 40 million C$ in just two years.

A marketing strategy would need something to market first, and RL's problem in the UK is that due to its image as a small, regional sport with limited interest which the events of the past year have underscored like nothing before, it doesn't have something to market. Those fundamentals would have to change first, and the blunt truth is that no one in the British game has a clue how to change them.

As with any other startup league, capital would have to be raised by selling franchises based on the proposed league's prospectus. Someone would first have to create a plan and then turn that into a prospectus for potential franchise owners. The only thing different from Jason Moore's concept would be the geographic scale and the resultant potential for sponsorship and TV contracts.

I only referenced it in the context of a team over here playing in an English league. Naturally those of English heritage are less likely to think that a nutty idea than others are, though even with my English heritage it still sounded nutty to me at first.
Yes, numerous posters in the Toronto Wolfpack fan groups seem to be either expats from the north of England or second-generation descendants of expats and the vast majority of those groups' members have British surnames. Many of the former group in particular have been active in talking up the game with their friends and bringing them along with the free tickets given to current ticket holders, they've mentioned doing that. Surnames indicating other ethnic backgrounds common in the Toronto population such as Italian, Greek or Portuguese are not very common in those groups.

Two things really. First, English is the most numerous ethnic background in the Greater Toronto Area according to census data and a decent percentage of that big number have their family ties going back to the RL heartland in the north of England. Second, Torontonians were already accustomed to Toronto having the sole Canadian team in foreign leagues in baseball, basketball and (before Vancouver and Montréal were given MLS franchises) soccer. Those two things meant that the concept could be accepted more easily and widely in Toronto than elsewhere.

It's about the latter, talk of a new league in North America basically died with the failure of Jason Moore's company. The unique factors which helped the Wolfpack succeed in Toronto not existing in other metropolises over here, more teams following that path are unlikely to do so successfully.
That leaves just one other option: a new transatlantic league set up to be a major league in all respects and provide an RL equivalent of Super Rugby and Pro14. That might be the only possible way to sell RL successfully in the Big Apple, but it would not have any room whatever for error.